For my next battery projects I wanted to have laser cut copper sheets to do Nickel-copper sandwiches. If there's no fitting system that's compact and fits on an desktop, I'll look into desktop CNCs. However, I wanted to know if anyone tried to "cut" copper with a laser system like the xTool F1 or similar and what happend. The Thickness I'm looking for is up to 0,2mm copper. Any tipps are appreciated and if it's not possible for that price so be it. Than you everyone for any information 🙏🏾.

Anyone stateside have Eve 30P cells? Looking for 100-150.

With batteries getting expensive everyone opting to up their capacity on their tool batteries. I’m running out of places to buy from - lionwholesale and diy500 out of stock!

Battery specs: 3.4kWh, 72V nominal, 45Ah, 140A continuous, 160A peak rated, 20s11p.

Made from SVOLT N21700CM cells individually tested and paired based on IR and capacity (I used an industrial 8-channel battery tester for capacity and the FNIRSI HRM-10 for IR testing)

Cells are welded in a hex pattern with 0.2mm nickel strip (first photo) with my AwithZ UF20B. Additional flexible bussing was soldered on top to decrease series resistance (can be seen in the second photo).

Each side of the internal cell frame is made from two pieces of 3D printed ABS-GF filament from Bambu lab bonded together down the center with ABS slurry. The outer frame is made from four dovetailed 3D prints using Fiberon ASA-CF06 from Polymaker which were bonded with a slurry of the same filament, acetone polished, and then matte 2k clear coated.

It uses a QS8 connector for main power output and a hooded XT-60 for charging. The third port on the BMS enclosure is for the JK BMS LCD that mounts to my handlebars :)

Melbourne Australia.

They come from batteries used for 1-2 years under warranty then replaced so most cells are in great shape.

From tests I have seen from buyers, about a 7% loss on average.

$2 each. I also do bulk pricing. Thanks and let me know :)

I have a massive amount so just let me know how many you want and we can work out pricing 💪

The canada sources in the sticky seem ...out of date. Any western Canada suppliers or folks w a flat? Thks! All incan find around here are like 25.00 for a cell and that's ludicrous

Hi everyone,

I appreciate this isn't directly battery-related, but I've been looking for information on the ATORCH DL24 electronic load testers, and this seems to be one of the few groups where people are actually using them!

I'm currently working on an electronics project that requires some load testing, and I'm considering buying one of the newer DL24 150W models.

Before I buy one, I'd like to find out a bit more about the Windows software, particularly its data logging capabilities.

Ideally, I'd like to set a constant current load, leave it running for a set period (say 30 minutes or an hour), and have the software record the voltage and current throughout the test.

I'd then like to export the results to a CSV file or similar so I can look at the readings afterwards.

One other important thing is what happens if the device I'm testing shuts down during the test. Does the software retain the readings up to that point, including when the voltage dropped, or does it lose the data?

Does anyone here use the DL24 with the Windows software and know whether it can do this?

Thanks in advance for any help.

Lithium batteries can't melt 6kg bags of salt

I only bought two mini flats it's only 200 batteries.

How unsafe would it be to store probably 4 pallets stacked with boxes of lithium, ni-cd, and ni-mh batteries inside a concealed conex? Asking for workplace safety

I am trying to solder my my BMS wires and all I get a hard metal balls that once melt will never melt again. I’m trying to get it to attach Brand new solder iron and pic of my flux in the 3rd pic

I had the iron set to 300-350C then set it to max once nothing was melting after about 40 minutes I stopped trying because I must be doing something wrong

Has anyone actually opened up a RAD-S1304Y battery and looked at what’s inside? Specifically, has anyone made modifications to address the issues Soteria pointed out in their teardown findings?
From what I’ve read, the concerns include lack of cell balancing, no dedicated venting path, inadequate wire sizing relative to fuse protection, and no thermal barriers between cells.

I’ve built several lithium battery packs ranging from 8s to 12s, so I’m comfortable with battery construction and BMS setups. I’m curious how these packs are actually laid out internally and whether any of these issues can realistically be addressed without completely redesigning the pack.

I’m not looking to reinvent the wheel if someone has already done the work. Has anyone documented a teardown, identified the exact cells and BMS, or figured out what would be required to make these packs safer?

Interested in actual findings and firsthand experience, not just speculation.

Hi everyone!
I have an Eaton 5PX3000iRT2U and have ordered six CSB HR 1234 WF2, 12 V 9 Ah AGM batteries (Allegro offer number: 18880656994).
I’m looking for help identifying the correct factory arrangement of the six batteries in the original plastic tray and the wiring layout.
Specifically, I’d like to confirm:
The physical orientation and placement of all six batteries.
The correct series interconnection order.
How the red and black leads and the UPS connector should be routed.
Whether anyone has photos of the original battery pack or an official wiring diagram for this exact UPS model.
I want to reproduce the factory wiring rather than guess, since an incorrect connection could damage the UPS or cause a dangerous short circuit.
Does anyone own this model and have clear photos of the original battery tray and wiring, or access to the relevant service documentation?
Thanks in advance!

Hello all

I’m running a simple ESP32 CYD which is essentially a microcontroller with built in display and it takes 5v input. I want to run this from a 18650 and I can’t believe how difficult it is to source a small, reasonably priced module that integrates charging protection and a 5v boost for the output. I can see people recommend charging modules and I can see people recommend 5v boosts online, but I can’t find a recommended all in one module. Normally with these things, there is a “go-to” product…

I found these modules and purchased some but I find they get warm but worryingly a few of the reviews report they get near to 100deg C so I’m worried about using them.

Has anyone got any first hand recommendations? I’m keen to find something safe as much as anything!

Cheers
Chris

I have an ncr double battery holder and 2 18650 lion battery cells and I also have tp4056 charging module and boost converter do I need anything more to power my esp 32 s3 n16r8

I have three 48 volt 20 amp hour Unit Power Pack brand ebike batteries that are about 5 years old.

Three summers ago I got covid and the bikes and batteries were not used and just sat. They did not freeze.

One battery appears to be 0 volts. Will not take a charge from the charger. It is a triangle battery and already under a recall.

Second one has some voltage and will not take a charge from the charger.

The third battery I rode today started out with 48 volts and now has 46 volts. The battery charger just shows the red and green light as if it's fully charged. This one baffles me because I am using the original three pin charger that came with it.

I looked for how to dispose of these batteries and Google just has me running in circles with one company that does not have places where I live or will not accept bicycle batteries.

I am tempted to put them all in an old wood stove in the middle of my yard and use a nail gun to make some fireworks 🤪🤪🤪. /S

Are any of these batteries worth your time?

How do you guys dispose of your unwanted batteries?

I am going to be switching my bikes to lithium iron phosphate batteries because I don't need the lightest and densest battery.

I better order more batteries.

I have this 3x 18650 holder, and I want to know: what else do I need to build diy powerbank. What board should I use to ensure it doesn't burn out when charging? Will I be able to attach a wireless charging module?